Troubleshooting Guide for Giant Residential Gas-fired Water Heaters

Quick Guide to Troubleshooting

This guide provides troubleshooting steps for Giant residential gas-fired water heaters with atmospheric vents. Before performing any troubleshooting, ensure the unit is serviced by a qualified technician. Always verify that the manifold gasket is properly sealed, the viewport is intact, and there are no gas leaks at the pilot or manifold connections.

Burner and Pilot Light Issues

If the burner fails to ignite or the pilot light will not stay lit, check the following:

• Pilot Light: If the pilot is not lit, attempt to light it. If it fails, check for air in the gas line, dirt in the gas lines, or a clogged pilot line/orifice.
• Thermal Switch: If the thermal switch has tripped, inspect the wire lead connections for looseness and ensure they are tight.
• Thermocouple: A non-functioning thermocouple may need to be replaced.
• Gas Supply: Ensure there is gas supply and that the gas pressure is sufficient.
• Environment: If the heater is installed in a confined area, ensure there is adequate fresh air ventilation.

Water Temperature and Supply Problems

If you are experiencing insufficient hot water or high operation costs, consider these factors:

• Thermostat Settings: Ensure the temperature dial is set to the desired temperature. If the thermostat is set too high, it increases costs; if too low, it results in insufficient hot water.
• Sediment Build-up: Sediment or lime in the tank can reduce efficiency and hot water supply. Drain and flush the tank if necessary.
• Piping Issues: Check for wrong piping connections, leaking faucets, or wasted hot water. Insulate long runs of exposed piping to maintain temperature.
• Heater Size: If the water heater is too small for the demand, consider installing an adequate heater.

Operational and Safety Concerns

Address specific operational anomalies as follows:

• Smelly Water: This is often caused by sulfides in the water. Replace the anode with a special anode.
• Drip from Relief Valve: This may indicate excessive water pressure or heater stacking. Use a pressure-reducing valve and lower the thermostat setting.
• Combustion Odours or Soot: These issues often stem from insufficient secondary air or a blocked flue/vent system. Ensure the heater has proper ventilation and clean the flue, flue baffle, and burner.
• Condensation: If condensation occurs, increase the temperature setting.